Sayyiduna Ka'b bin 'Ujrah (may Allah be pleased with him) narrates that he was in the state of Ihram with the Messenger of Allah (peace and blessings be upon him). Lice were troubling him. The Messenger of Allah (peace and blessings be upon him) ordered him to shave his head and said: Fast for three days, or feed six needy people two mudd (of dates) each, or slaughter a goat. Whichever of these you do will suffice.